BA have just issued a safety notice ref the chock incident, but also an incident involving a traffic cone being suck out of the hands of the ground handling person and into the operating engine.
I took copies of the safety notice and handed them to the local handling agency duty manager, asking him to re-iterate the procedures of meeting an A/C on stand to his staff.
Hopefully someone elses mistake will be a wake up call to everyone else involved in aircraft ramp activities.